Windows 10 Build 10102 has leaked in some of the screenshots. Interesting visible changes that these screenshots reveal are: 3D effect Live Tile, enhanced Cortana, Aero Glass like effect in Start Menu and settings re-design.
3D Live Tile effect:
The Live Tile has a 3D flipping animation. Looks nice though!
Aero Glass effect in Start Menu:
Start Menu has a new look to show-off that can be termed as Aero Glass effect. Seems more Start Menu personalization options are coming in further builds.
Settings have change to show:
Cortana has also gone though some changes and now has a slightly different look than what we see on Build 10061.